No abstract available
MeSH terms
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Acquired Immunodeficiency Syndrome / epidemiology
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Centers for Disease Control and Prevention, U.S.
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Follow-Up Studies
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HIV Infections / classification
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HIV Infections / epidemiology*
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HIV Infections / immunology
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HIV Seropositivity / epidemiology
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Homosexuality*
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Humans
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Immunologic Techniques
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Italy / epidemiology
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United States